package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.security.auth.login.LoginException;
import java.time.LocalDateTime;
import java.util.HashMap;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WeChatProperties weChatProperties;

    private static final String URL="https://api.weixin.qq.com/sns/jscode2session";

    /**
     * 微信登录
     * @param userLoginDTO
     * @return {@code User }
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //通过HttpClient调用微信接口服务，获取当前用户的openid
            //这部分根据使用的第三方接口文档开发
        HashMap<String,String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",userLoginDTO.getCode());
        map.put("grant_type","authorization_code");

        String json=HttpClientUtil.doGet(URL,map); //返回的是String类型json对象
        JSONObject jsonObject=JSON.parseObject(json);
        String openid=jsonObject.getString("openid");
        //判断openid是否为空，为空表示登录失败，抛出异常
        if(openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断当前用户是否是新用户,如果是新用户，完成注册
        User user= userMapper.getByOpenid(openid);
        if (user==null){
            user= User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();

            userMapper.insert(user); //要获取id
        }

        return user;

    }
}
